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Re: This application is not a valid win32 application

Without further details it is not really possible to provide much help. However, one possible cause of this error is where the program has been compiled for x64 computer and it is tried to be used on x86 computers (or x64 computer with 32 bit version windows). This could explain why it works on your computer but not on the customer's PC. What version of windows are you using and what version is your customer using?